US9440285B2 - Device for forming thin films and method for using such a device - Google Patents

Device for forming thin films and method for using such a device Download PDF

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US9440285B2
US9440285B2 US13/384,025 US201013384025A US9440285B2 US 9440285 B2 US9440285 B2 US 9440285B2 US 201013384025 A US201013384025 A US 201013384025A US 9440285 B2 US9440285 B2 US 9440285B2
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powder
scraper
cylinder
film
spreading
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US20120164322A1 (en
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Patrick Teulet
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Phenix Systems
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Phenix Systems
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • B22F3/1055—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/31—Calibration of process steps or apparatus settings, e.g. before or during manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/60—Planarisation devices; Compression devices
    • B22F12/63—Rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/60—Planarisation devices; Compression devices
    • B22F12/67—Blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/006—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of flat products, e.g. sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0244—Powders, particles or spheres; Preforms made therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/008—Accessories or implements for use in connection with applying particulate materials to surfaces; not provided elsewhere in B05C19/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/06—Storage, supply or control of the application of particulate material; Recovery of excess particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/50—Means for feeding of material, e.g. heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • B23K2201/18—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B29C67/0077—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y02P10/295—

Definitions

  • the invention relates to a device for forming at least one thin film made of a powder material, used during the action of a laser on said material, and a method for forming thin films using this device.
  • Such a device is used during a method, known as laser sintering or laser fusion, for the sintering or fusion of a powder material, using a laser, in a thermal chamber.
  • powder material refers to a powder or powder mixture, said powder(s) optionally being metallic, organic or ceramic.
  • powder or powder material will be used.
  • FR-A-2 856 614 discloses a device for forming thin films made of a powder material, comprising a cylinder provided with a longitudinal groove. This groove is suitable for taking the powder material in a storage area, moving it to a deposition area and depositing a film of material on said deposition area. After deposition, the cylinder compacts the film using a portion of the surface thereof devoid of a groove.
  • Such a device has a relatively long implementation time. Indeed, between each movement of the cylinder between the storage and deposition areas, i.e. after each powder material film formation and before another film formation, it is necessary to reposition the cylinder such that the groove thereof is in a position wherein it can take the powder material. For this, it is necessary to stop the rotation of the cylinder.
  • the surface of the cylinder used for compacting only represents 80% of the total developed surface area, given that the groove is not involved in compacting. For this reason, the length of the film suitable for compacting, in one rotation of the cylinder, is limited to approximately 80% of the circumference of the cylinder.
  • EP-A-776 713 describes a method for producing a sand mould wherein a cylinder spreads and compacts the sand from a hopper in a plurality of layers on a receiving surface.
  • US-A-2005/0263934 discloses a device comprising a cylinder protected by a cover, the assembly moving to spread and compact, on a receiving surface, a powder, prior to the sintering thereof by a laser. This powder is supplied by a feed member situated above the cylinder.
  • the invention is particularly intended to remedy these drawbacks by proposing a high-performance and rapid device for forming thin films made of a powder material.
  • the invention relates to a device suitable for forming at least one thin film made of a powder material comprising a storage area, a deposition area, a cylinder having a circular base for depositing and compacting the powder material, said material having been previously moved from a storage area to a deposition area, characterised in that the device comprises:
  • this film may have a greater length than formed with the grooved cylinder known from the prior art.
  • the device may incorporate one or a plurality of the following features:
  • the invention also relates to a method for forming at least one film made of powder material using a device according to any of the above features, characterised in that it comprises steps consisting of:
  • the method may incorporate at least one step where:
  • FIG. 1 is a general schematic view of a roller and a scraper according to one embodiment of the invention
  • FIGS. 2 to 11 are schematic side illustrations of the implementation of the device, the powder material being represented by a dark line on the storage and deposition areas and
  • FIG. 12 is a schematic illustration, on another scale, of the implementation of a device according to a second embodiment of the invention.
  • the roller or cylinder 1 represented in FIG. 1 is made of a material that is easy to machine, stable and insensitive to environmental conditions.
  • the material used is insensitive to the powder material and is stable at the pressure and temperature conditions usually applied during a laser sintering method.
  • this roller 1 should be suitable for not undergoing any deformation in the range of operating temperatures generally encountered, i.e. between ambient temperature and approximately 1200° C.
  • this roller 1 is made of a material suitable for the operating temperature.
  • the roller is metallic, coated with tungsten carbide for use up to 300° C.
  • the roller is made of a single material, tungsten carbide.
  • a ceramic for example alumina or zirconia, is preferably used.
  • the roller 1 is cylindrical with a circular base.
  • the outer diameter D thereof is dependent on the length, or height H, thereof. It is necessary to have a mechanically rigid roller to produce a film of powder material with a thickness wherein the precision is less than or equal to 10% of the thickness of the film produced. For example, for a 20 ⁇ m thick film, the variation in thickness should be less than 2 ⁇ m.
  • the cylindrical surface 2 of this revolving cylinder 1 is continuous and smooth, without any bumps or roughness.
  • the apparent roughness Ra of the cylindrical surface 2 is less than the grain size of the smallest particles of the powder material. In this way, the smallest powder particles do not penetrate the hollows of the cylinder surface. The powder does not remain on the cylindrical surface and the powder can be spread.
  • the surface 2 has a glacial polish appearance, i.e. with an apparent roughness Ra in the region of 0.06 ⁇ m.
  • This cylinder 1 is mounted, in a manner known per se, to be rotated about the main axis of revolution A thereof. This rotation may be carried out in the direction indicated by the arrow F 1 in FIG. 2 . In an alternative embodiment, according to the nature of the powder material, the rotation may be carried out in the reverse direction.
  • the rotation of the roller 1 may be suitable, depending on the powder material, for being carried out in the trigonometric direction, not shown in FIGS. 2 to 11 , or in the inverse trigonometric direction.
  • This roller 1 is associated with a scraper 3 also shown in FIG. 1 .
  • This scraper 3 has a length Lr equal to the height H of the cylinder 1 .
  • the scraper 3 comprises a lip 4 .
  • the lip 4 comprises an edge 41 formed by the intersection of two plane surfaces according to an angle less than or equal to 90°.
  • the lip 4 is attached to the main body 31 of the scraper 3 .
  • the lip 4 is advantageously integral with the body 31 .
  • This scraper 3 is made of a material suitable for the operating temperature. In other words, the scraper 3 is, advantageously, made of the same material as the roller 1 .
  • the scraper 3 is mounted on a free edge of the protective cover 5 of the cylinder 1 . This mounting is carried out in a removable manner, enabling the replacement, in the event of wear or damage, of the scraper 3 .
  • the scraper 3 is permanently attached to the cover 5 .
  • the cover 5 has a U-shaped cross-section.
  • the cover 5 covers the cylinder 1 on the entire height H thereof, and on the cross-section S thereof.
  • this cover 5 partially covers the cylinder 1 , while leaving same rotatably movable with a part of the cross-section S extending below the cover 5 , via an opening O of the cover 5 facing downwards, i.e. towards the powder material to be spread.
  • the assembly formed by the scraper 3 , the cover 5 and the cylinder 1 is mounted on a frame or carriage, not shown and known per se, suitable for moving in translation between an area 6 for storing powder material and an area 7 for depositing powder material.
  • Such storage 6 and deposition 7 areas are known from FR-A-2 856 614.
  • the storage area is formed by a horizontal plate 6 mounted on a plunder rod 8 .
  • This plunger rod 8 is movable in translation, in an upward direction, inside a cylindrical volume having any cross-section.
  • This plate 6 can thus be raised and lowered in a vertical direction, represented by the double arrow F 2 .
  • the plate 6 is situated upstream from and in the vicinity of a horizontal plate 7 acting as a deposition area and mounted on a plunger rod 9 .
  • This plunger rod 9 is also movable in translation, in an upward direction, inside a cylindrical volume having any cross-section.
  • the plate 7 can thus also be raised and lowered in a direction, represented by the double arrow F 3 , parallel with the direction F 2 of movement of the plate 6 .
  • the plate 7 is represented as identical to the plate 6 .
  • the shape and dimensions of the plates 6 , 7 are different.
  • the roller 1 and the scraper 3 are in a first so-called idle position. In this position, with reference to FIG. 2 , they are positioned to the left of one end 10 of the storage plate 6 , opposite the nearest end 11 of the plate 7 .
  • the scraper 3 is, by the edge 41 of the lip 4 , in the vicinity of one edge 12 of any film, or volume, 13 having any initial thickness e 1 of powder material 14 .
  • the terms “high”, “low”, “upper” and “lower” relate to the operating configuration of the equipment shown in the figures. In this way, for example, an “upper” part is facing upwards in these figures.
  • the upper face 130 of the volume 13 is in a plane parallel with and above the upper face 70 of the plate 7 .
  • the cylinder 1 is rotated about the axis A thereof according to a predetermined speed. This rotation F 1 is carried out in a trigonometric direction or in an inverse trigonometric direction, depending on the nature of the powder material 14 .
  • the rotational speed is dependent on the linear translation movement speed of the carriage whereon the scraper 3 , cover 5 and cylinder 1 assembly is mounted.
  • the tangential speed of the cylinder is synchronised with a linear speed of the carriage, in a range of synchronisation ratios that can vary from ⁇ 100 to 0 and from 0 to 100. The synchronisation ratio is dependent on the physicochemical nature of the powder material.
  • the ratio between the tangential speed of the cylinder 1 and the linear speed of the carriage is suitable for the nature of the powder material 14 and the thickness of the films to be produced.
  • the cover 5 Simultaneously with the rotation of the cylinder 1 , the cover 5 , and therefore the scraper 3 , is lowered.
  • This movement is produced, for example by pivoting along the arrow F 4 in FIG. 3 , in the opposite direction of the rotation along F 1 of the cylinder 1 .
  • This pivoting of the cover 5 is carried out about a horizontal axis B.
  • the cover 5 is lowered by a vertical translation movement.
  • the assembly comprising the cylinder 1 , cover 5 and scraper 3 is moved in horizontal rectilinear translation.
  • the upper face 130 of the film, or volume, 13 of powder material is situated at a higher height than that of the edge 41 , as shown in FIG. 2 .
  • the scraper 3 extracts a predefined volume of powder material.
  • the movement of the assembly is carried out horizontally, along a direction F 5 parallel with a main plane P 1 of the plate 7 and in the direction thereof.
  • P 1 references a horizontal plane generated by horizontal movement of the edge 41 above the plate 6 . Due to the lowering of the cover 5 , the plane P 1 is situated below a plane P 2 tangent to a lower generatrix G of the cylinder 1 . In other words, in this position illustrated in FIG.
  • the scraper 3 is suitable for pushing, along the arrow F 5 of the extracted powder material 14 , below the face 130 , in the volume 13 , in the direction of the plate 7 without the rotating roller 1 coming into contact with the powder material 14 , since the cylinder 1 generatrix G is situated above the plane P 1 .
  • the scraper 3 thus pushes a predetermined quantity of powder of the first end 10 of the storage area 6 to the second end 11 thereof.
  • the quantity of powder 14 pushed by the scraper 3 is defined by the difference between the plane P 1 and the upper face 130 of the volume 13 , it being understood that it is possible to vary this difference by raising or lowering the plate 6 .
  • the translation movement, along the arrow F 5 is carried out at a predetermined speed, selected according to the nature of the powder material and/or the desired features of the final layer. In this instance, this speed is generally between 0.05 m/s and 1 m/s for a movement of the cylinder 1 and scraper 3 assembly above the feed area 6 .
  • the scraper 3 and the cylinder 1 move in translation at the same speed, keeping a constant distance E between them.
  • This is enabled by the presence of a common member, i.e. a carriage, not shown, defining the axes A and B of rotation, respectively, of the cylinder 1 and the cover 5 .
  • the movement speeds of the scraper 3 and the cylinder 1 may be different and vary according to the film formation phases. In other words, the distance E is varied between the cylinder 1 and the scraper 3 .
  • a solid area 15 provided on the frame connects the plates 6 , 7 and enables the passage of powder extracted from the volume 13 between the plates 6 and 7 .
  • This area 15 is situated in a plane P 3 parallel with the plane P 1 and below said plane.
  • This plane P 3 is defined, in other words, by the lower face of the film of powder material deposited on the plate 7 .
  • the cover 5 is raised such that the lip 4 of the scraper 3 is above the pile T of powder 14 and does not impede the action of the cylinder 1 .
  • the roller 1 rotating along F 1 , makes a horizontal translation movement along F 5 , from the end 11 towards the end 17 of the plate 7 opposite the end 16 , at a given speed, which may be different to that observed during the movement above the area 6 .
  • the movement results in the cylinder 1 , hitherto situated above the plate 6 , to come into contact, by the cylindrical surface 2 thereof, with the pile T.
  • FIG. 7 illustrates the following film formation phase per se or spreading of the powder material 14 on the deposition area 7 using the cylinder 1 .
  • This film formation is performed uniformly by translation movement, along the arrow F 5 , of the cylinder 1 rotating along F 1 .
  • the cylinder 1 pushes the excess powder 14 back in front of said cylinder.
  • the rotation and movement of the cylinder 1 parallel with the plane P 1 makes it possible to spread the powder 14 in a film 13 ′ of a predetermined thickness.
  • the surface 2 of the cylinder 1 is smooth and has a low apparent roughness, similar to that of a glacial polish, preventing any adherence of the powder 14 on the cylindrical surface 2 of the roller 1 .
  • This makes it possible to obtain a homogeneous and regular film 13 ′, having a minimum thickness of approximately 1 ⁇ m, according to the geometric precision, the surface condition of the cylinder 1 and/or the grain size of the powder. In the example described, the minimum feasible thickness is approximately 5 ⁇ m. Films having a thickness greater than 10 ⁇ m can also be produced.
  • the cylindrical surface 2 of the cylinder 1 is not in contact with the plane P 1 of the film previously sintered or fused using a laser. This lack of contact is dependent, inter alia, on the homogeneity and compactness of the powder film and the grain size and granularity thereof.
  • the formation of films made of powder material 14 may be carried out in a single iteration, i.e. a single return passage of the cylinder 1 and the scraper 3 .
  • a single iteration i.e. a single return passage of the cylinder 1 and the scraper 3 .
  • films of intermediate thickness between the thickness of the first film and the thickness of the final film are formed.
  • the thickness of an intermediate film, formed during an iteration n may be subject to a variation defined according to the following function: (ax+b)/(cx+d). It is possible use other types of variation of the thickness between two intermediate films, in order to approach, more or less progressively, the desired final thickness of the film 13 ′ before compacting.
  • the first passage i.e. the first iteration, for depositing the first film
  • the subsequent iterations are similar, until the desired thickness of the powder material film is obtained.
  • the thickness of the film of powder material deposited on the deposition area, prior to compacting is greater than the thickness of the compacted final film.
  • this thickness is at least twice the thickness of the compacted final film.
  • the thickness of the layer 13 ′ is greater than the desired thickness of the finished film 13 ′′.
  • the roller 1 has reached the end 17 of the plate 7 and has finished spreading the powder material 14 in a film 13 ′ on the deposition area 7 .
  • the cylinder 1 rotates continuously, and the scraper 3 is raised. The spreading phase is complete.
  • the cylinder 1 , scraper 3 and cover 5 assembly returns to the position occupied in FIG. 6 , i.e. at the end 16 of the deposition area 7 . During this return, along the arrow F 7 , rotation of the roller 1 is maintained. Movement along F 7 is performed at a higher speed than the initial movement along F 5 . In an alternative embodiment, the movement speeds, along the arrows F 5 and F 7 , are identical. The movement speeds along the direction F 5 may vary between each iteration.
  • the plunger 9 of the plate 7 is lowered, along F 3 , by some tens of microns so that the rotating roller 1 does not come into contact with the previously spread film 13 ′.
  • the speed of this movement may be optionally equal to the speeds observed during previous translation movements above the areas 6 and 7 .
  • the plunger 9 of the deposition area 7 is raised by a value such that the distance between the lower face of the deposited film 13 ′, i.e. the upper face 70 of the plate 7 when said plate is empty, and a lower generatrix G of the cylinder 1 is equal to the desired final thickness of the film 13 ′′.
  • This thickness d may be achieved in a single passage, as illustrated in FIG. 10 , by a translation movement along F 5 , of the rotating cylinder 1 , the scraper 3 being held in the raised position.
  • This compacting phase is repeated the number of times required, according to the powder material 14 .
  • the number of passages required to achieve the desired thickness d of the compacted film 13 ′′ is dependent on the physicochemical nature of the powder 14 , the grain size and/or granularity of said powder.
  • the mathematical progression intended to achieve the desired thickness d of the film 13 ′′ of material 14 is, for example, a decreasing non-linear progression, i.e. of the type (ax+b)/(cx+d). This progression is similar to the progression intended to achieve the predetermined thickness of the spread film.
  • the compacting to be carried out is calculated on the basis of the thickness of each constituent film of the object to be produced. This thickness is dependent on the height of the object and the desired number of films to produce the object. Due to the powder density variation in a film, the thickness d of the compacted final film is equal to the thickness of a constituent film of the object increased by a fraction of said thickness as a function of a defined compacting ratio.
  • the cylindrical surface 2 of the roller 1 During compacting, it is necessary for the cylindrical surface 2 of the roller 1 to have a sliding friction coefficient Fg on the powder 14 less than the sliding friction coefficient of the powder 14 on the surface of the deposition area 7 . In this way, during compacting, the powder material 14 remains deposited on the deposition area 7 and is not moved by the rotating roller 1 .
  • the sliding friction coefficient Fg is approximately 0.02.
  • the roller 1 When the compacting is carried out, as illustrated in FIG. 10 , the roller 1 is situated beyond the end 17 of the deposition area 7 , in the same configuration as that represented in FIG. 8 .
  • the cylinder 1 rotates continuously, with the scraper 3 raised.
  • the cylindrical surface 2 is closest to the upper face 70 of the plate 7 .
  • the scraper 3 is lowered again, along F 4 , to push another quantity of powder material 14 in another film formation cycle.
  • the plunger 9 of the deposition area 7 is lowered again, in order to release the film 13 ′′ from the cylinder 1 , which is rotating continuously and should not be in contact with the compacted layer 13 ′′.
  • the film 13 ′′ When the film 13 ′′ is compacted, it undergoes a laser treatment, not illustrated, i.e. sintering or fusion, enabling the formation of a solid film forming a three-dimensional object.
  • a laser treatment not illustrated, i.e. sintering or fusion, enabling the formation of a solid film forming a three-dimensional object.
  • FIG. 12 illustrates a further embodiment wherein a second cylinder R 2 , for example identical to the cylinder 1 , is arranged in the vicinity thereof.
  • the axes of rotation of the two cylinders 1 and R 2 are parallel.
  • the cylinders 1 , R 2 are arranged such that the respective contact areas thereof, i.e. lower generatrices of the cylinders, are at different heights.
  • This difference X in height is adapted according to the nature of the powder 14 and the thickness of the compacted film to be achieved. In other words, X is the result of a decreasing non-linear progression of the type (ax+b)/(cx+d).
  • this second cylinder R 2 thus makes it possible, in a single passage, to carry out compacting which, with a single cylinder 1 would have required two passages. This reduces the time required to obtain a compacted film 13 ′′.
  • the rotational speed and/or the direction of rotation of the cylinders 1 , R 2 are adjustable. These parameters may be optionally identical for both cylinders 1 , R 2 . The same applies for the translation movement parameters of the cylinders 1 , R 2 .
  • a tool R 3 is represented schematically in FIG. 12 , in the vicinity of the scraper. It consists of a calibration tool, for example a mill type tool.
  • the tool R 3 comprises working parts, in this instance teeth, made of a material having a hardness greater than that of the film 13 ′′ after said film has undergone laser treatment, i.e. after the compacted powder material has undergone laser fusion or sintering.
  • This tool R 3 is, for example, made of tungsten carbide.
  • the film of compacted powder material treated with a laser is, for more clarity, represented in dotted lines under the single tool R 3 , it being understood that this film extends under the entire plate 7 .
  • the tool R 3 makes it possible, by preceding the scraper 3 when the powder 14 is pushed onto the plate 7 to produce an additional film, to calibrate the previously produced powder film 13 ′′, once said film has been treated with a laser.
  • R 3 thus makes it possible to render the surface of this film even, by removing a few mm 3 of material, prior to the formation of the subsequent film.
  • R 3 is mounted on the same carriage as the cylinders 1 , R 2 and the scraper 3 .
  • R 3 is mounted removably and/or on another carriage to that supporting the scraper 3 and the cylinders 1 , R 2 .
  • the speeds of rotation and movement of the tool R 3 are suitable for the powder material 14 when said material has been treated with a laser.
  • the directions of movement of the cylinders R 2 , 1 and the tool R 3 are coordinated.
  • the cylinder 1 , cover 5 and scraper 3 assembly are suitable for vertical movement. It is then possible to raise the plunger 8 and lower the cylinder 1 , cover 5 and scraper 3 assembly to adjust the quantity of powder 14 to be spread.
  • the continuous rotation of the roller 1 makes it possible to obtain a rapid implementation of said roller, without stopping the cycle to reposition same.
  • the shape of the cover 5 may be different to that described.
  • the scraper 3 may be attached to an arm connected to an axis of rotation of the cylinder, said cylinder being devoid of a protective cover.

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FR0903454A FR2948044B1 (fr) 2009-07-15 2009-07-15 Dispositif de mise en couches minces et procede d'utilisation d'un tel dispositif
FR0903454 2009-07-15
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JP5977170B2 (ja) 2016-08-24
JP5993038B2 (ja) 2016-09-14
FR2948044B1 (fr) 2014-02-14
US20120164322A1 (en) 2012-06-28
DK2454040T3 (da) 2014-09-22
JP2012532995A (ja) 2012-12-20
EP2454040B1 (fr) 2014-09-03
FR2948044A1 (fr) 2011-01-21
WO2011007087A2 (fr) 2011-01-20
JP2015120352A (ja) 2015-07-02
EP2454040A2 (fr) 2012-05-23
PL2454040T3 (pl) 2015-03-31
WO2011007087A3 (fr) 2012-01-19
ES2519340T3 (es) 2014-11-06

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